Photographic developing apparatus.



Patented Aug. l9, I902.

E. BIMAILHU. PHUTOGRAPHIC DEVELOPING APPARATUS.

(Application filed Nov. 15, 1897.)

(No Model.)

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UNITED STATES PATENT OFFICE;

EMILE RIMAILHO, OF PARIS, FRANCE.

PHOTOGRAPHIC DEVELOPING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 707,450, dated August 19, 1902.

Application filed November 15, 1897. Serial No. 658,553. (No model.)

T0 whom it may concern:

Be itknown that LEMILE RIMAILHO, a citizen of the Republic of France, residing at Paris, France, have invented certain new and useful Improvements in Photographic Developing Apparatus, of which the following is a specification.

The present invention relates to a holder for developing photographic negatives by which the negative under treatment can be developed, while protected against actinic rays, without removing it from the holder. According to this invention the bottom of the holder is so arranged that while liquid can easily enter and leave the holder harmful light cannot do so.

In the accompanying drawings, Figure 1 is a section of the holder and the tray in which it is placed. Fig. 2 is a perspective of the same, and Fig. 3 a perspectiveof the cover of the tray for the developer. Fig. dis a perspective view, parts being broken away and in section, of the frame A and its bottom, showing the arrangement of the grooves O.

The frame A in which the plate is to be developed is provided with a bottom B of glass which will exclude actinic rays, fitting into grooves C, provided with recesses so arranged that no direct light can enter the interior of the holder, while liquid can do so.

On one side of the frame A is a projection D, provided with a slot communicating with the interior of the frame and of such dimensions as to admit the plate to be operated upon. The slot can be closed by a device E like the plug of a cork, provided with a slot corresponding to the width and thickness of the plate and through which the plate F is inserted into the apparatus.

The end of the dark chamber G opposite to the frame A is provided with an inspection-tube H, which can be closed against light by a shutter actuated by a knob I.

The plate F is inserted through the slotted plug E. into the receptacle A and placed above the red or non-actinic glass B, and the receptacle is then placed, in the manner illustrated in Fig. l, in a tray J, partly filled with the developing solution,which enters through the light trapped openings of the grooves G into the receptacle and floods the plate F.

To inspect the plate, with a view of ascertaining whether development is complete or going on satisfactorily, the receptacle is withdrawn from the tray J and the developer allowed to leave in the same manner as it had entered through the holes communicating with the grooves C, after which it is placed into a frame L, Fig. 2, provided with a handle 0 and a receptacle M, into which the last remnants ,of the developer are allowed to drop, so as to prevent soiling the hands or clothes. The apparatus is fixed in the frame L by a spring-catch N, while the frame is also preferably provided with a pane of glass P. After opening the shutter, having covered, if required, with a black cloth, the plate may be examined through the tube H.

If on examination the plate F is found to be insufficiently developed, the process, as above described, is again repeated; otherwise the apparatus is detached from the frame L and placed in the cover K, which can be used as the fixing-bath.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. A holder for use in developing photographic negatives in full daylight, comprising a frame provided with a closable opening to admit a photographic plate and having passages arranged to admit liquid from the exterior of the frame to the interior thereof and at the same time prevent light from entering within the frame, a dark chamber combined with said frame and having a closable inspection-aperture at the end opposite to the frame and a non-actinic glass plate forming the bottom of the frame and secured in grooves therein, substantially as set forth.

2. A holder for use in developing photographic negatives in full daylight, comprising a frame with a closable opening through which a photographic plate is adapted to be inserted and having passages arranged to admit liquid from the exterior of the frame to the interior thereof and at the same time prevent light from entering Within the frame, means for sealing said closable opening against the admission of light after the photographic plate has been inserted and a nonactinic glass plate forming the bottom of the frame and secured in grooves in the latter, substantially as set forth.

3. A holder for use in developing photographic negatives in full daylight, comprising a frame having passages arranged to ad mit liquid from the exterior of the frame to the interior thereof and at the same time prevent light from entering within the frame, a projection on the frame having an opening through which the plate is adapted to be inserted, a plug having a slot to correspond to the width and thickness of the plate and adapted to register with an opening in the projection, and a non-actinic glass plate forming the bottom of the frame and secured in grooves in the latter, substantially as set forth.

4. A holder for use in developing photographic negatives in full daylight, comprising a frame with a closable opening to admit a photographic plate and having passages arranged to admit liquid from the exterior of the frame to the interior thereof and at the same time prevent light from entering within the frame, and a non-actinic glass plate forming the bottom of the frame and secured in grooves in the latter, in combination with a second frame into which the first frame is adapted to be placed, and a receptacle M carried by said second frame, all as and for the purposes specified.

5. A holder for use in developing photographic negatives in full daylight, comprising a frame with a closable opening to admit a photographic plate and having passages arranged to admit liquid from the exterior of the frame to the interior thereof and at the same time prevent light from entering within the frame, and a non-actinic glass plate forming the bottom of the frame and secured in grooves in the latter, in combination with a second frame into which the first frame is adapted to be placed and means for detachably securing the two frames together.

In witness whereof I have hereunto set my hand in the presence of two subscribing witnesses.

EMILE RIMAILHO.

Witnesses:

LOUIS SULLIGER, EDWARD P. MAoLEAN. 

